/* signals.c -- signal handling support for readline. */
-/* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc.
+/* Copyright (C) 1987-2009 Free Software Foundation, Inc.
- This file is part of the GNU Readline Library, a library for
- reading lines of text with interactive input and history editing.
+ This file is part of the GNU Readline Library (Readline), a library
+ for reading lines of text with interactive input and history editing.
- The GNU Readline Library is free software; you can redistribute it
- and/or modify it under the terms of the GNU General Public License
- as published by the Free Software Foundation; either version 1, or
+ Readline is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
- The GNU Readline Library is distributed in the hope that it will be
- useful, but WITHOUT ANY WARRANTY; without even the implied warranty
- of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ Readline is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
- The GNU General Public License is often shipped with GNU software, and
- is generally kept in a file called COPYING or LICENSE. If you do not
- have a copy of the license, write to the Free Software Foundation,
- 675 Mass Ave, Cambridge, MA 02139, USA. */
+ You should have received a copy of the GNU General Public License
+ along with Readline. If not, see <http://www.gnu.org/licenses/>.
+*/
+
#define READLINE_LIBRARY
#if defined (HAVE_CONFIG_H)
# include <sys/ioctl.h>
#endif /* GWINSZ_IN_SYS_IOCTL */
-#if defined (__GO32__)
-# undef HANDLE_SIGNALS
-#endif /* __GO32__ */
-
-#if defined (HANDLE_SIGNALS)
/* Some standard library routines. */
#include "readline.h"
#include "history.h"
-extern int readline_echoing_p;
-extern int rl_pending_input;
-extern int _rl_meta_flag;
+#include "rlprivate.h"
-extern void free_undo_list ();
-extern void _rl_get_screen_size ();
-extern void _rl_redisplay_after_sigwinch ();
-extern void _rl_clean_up_for_exit ();
-extern void _rl_kill_kbd_macro ();
-extern void _rl_init_argument ();
-extern void rl_deprep_terminal (), rl_prep_terminal ();
+#if defined (HANDLE_SIGNALS)
#if !defined (RETSIGTYPE)
# if defined (VOID_SIGHANDLER)
# define SIGHANDLER_RETURN return (0)
#endif
-/* This typedef is equivalant to the one for Function; it allows us
+/* This typedef is equivalent to the one for Function; it allows us
to say SigHandler *foo = signal (SIGKILL, SIG_IGN); */
typedef RETSIGTYPE SigHandler ();
-static SigHandler *rl_set_sighandler ();
-
-/* **************************************************************** */
-/* */
-/* Signal Handling */
-/* */
-/* **************************************************************** */
-
-/* If we're not being compiled as part of bash, initialize handlers for
- and catch the job control signals (SIGTTIN, SIGTTOU, SIGTSTP) and
- SIGTERM. */
-#if !defined (SHELL)
-# define HANDLE_JOB_SIGNALS
-# define HANDLE_SIGTERM
-#endif /* !SHELL */
-
#if defined (HAVE_POSIX_SIGNALS)
typedef struct sigaction sighandler_cxt;
# define rl_sigaction(s, nh, oh) sigaction(s, nh, oh)
#else
-typedef struct { SigHandler *sa_handler; } sighandler_cxt;
+typedef struct { SigHandler *sa_handler; int sa_mask, sa_flags; } sighandler_cxt;
# define sigemptyset(m)
#endif /* !HAVE_POSIX_SIGNALS */
-static sighandler_cxt old_int, old_alrm;
+#ifndef SA_RESTART
+# define SA_RESTART 0
+#endif
-#if defined (HANDLE_JOB_SIGNALS)
-static sighandler_cxt old_tstp, old_ttou, old_ttin;
-#endif /* HANDLE_JOB_SIGNALS */
+static SigHandler *rl_set_sighandler PARAMS((int, SigHandler *, sighandler_cxt *));
+static void rl_maybe_set_sighandler PARAMS((int, SigHandler *, sighandler_cxt *));
+
+/* Exported variables for use by applications. */
+
+/* If non-zero, readline will install its own signal handlers for
+ SIGINT, SIGTERM, SIGQUIT, SIGALRM, SIGTSTP, SIGTTIN, and SIGTTOU. */
+int rl_catch_signals = 1;
-#if defined (HANDLE_SIGTERM)
-static sighandler_cxt old_term;
+/* If non-zero, readline will install a signal handler for SIGWINCH. */
+#ifdef SIGWINCH
+int rl_catch_sigwinch = 1;
+#else
+int rl_catch_sigwinch = 0; /* for the readline state struct in readline.c */
#endif
+/* Private variables. */
+/* If non-zero, print characters corresponding to received signals. */
+int _rl_echoctl = 0;
+
+int _rl_intr_char = 0;
+int _rl_quit_char = 0;
+int _rl_susp_char = 0;
+
+static int signals_set_flag;
+static int sigwinch_set_flag;
+
+/* **************************************************************** */
+/* */
+/* Signal Handling */
+/* */
+/* **************************************************************** */
+
+static sighandler_cxt old_int, old_term, old_alrm, old_quit;
+#if defined (SIGTSTP)
+static sighandler_cxt old_tstp, old_ttou, old_ttin;
+#endif
#if defined (SIGWINCH)
static sighandler_cxt old_winch;
#endif
# endif /* !HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */
+ RL_SETSTATE(RL_STATE_SIGHANDLER);
+
#if !defined (HAVE_BSD_SIGNALS) && !defined (HAVE_POSIX_SIGNALS)
/* Since the signal will not be blocked while we are in the signal
handler, ignore it until rl_clear_signals resets the catcher. */
+# if defined (SIGALRM)
if (sig == SIGINT || sig == SIGALRM)
+# else
+ if (sig == SIGINT)
+# endif
rl_set_sighandler (sig, SIG_IGN, &dummy_cxt);
#endif /* !HAVE_BSD_SIGNALS && !HAVE_POSIX_SIGNALS */
switch (sig)
{
case SIGINT:
- {
- register HIST_ENTRY *entry;
-
- free_undo_list ();
-
- entry = current_history ();
- if (entry)
- entry->data = (char *)NULL;
- }
- _rl_kill_kbd_macro ();
- rl_clear_message ();
- _rl_init_argument ();
+ _rl_reset_completion_state ();
+ rl_free_line_state ();
+ /* FALLTHROUGH */
+ case SIGTERM:
#if defined (SIGTSTP)
case SIGTSTP:
case SIGTTOU:
case SIGTTIN:
#endif /* SIGTSTP */
+#if defined (SIGALRM)
case SIGALRM:
- case SIGTERM:
- _rl_clean_up_for_exit ();
- (*rl_deprep_term_function) ();
- rl_clear_signals ();
- rl_pending_input = 0;
+#endif
+#if defined (SIGQUIT)
+ case SIGQUIT:
+#endif
+ rl_echo_signal_char (sig);
+ rl_cleanup_after_signal ();
#if defined (HAVE_POSIX_SIGNALS)
+ sigemptyset (&set);
sigprocmask (SIG_BLOCK, (sigset_t *)NULL, &set);
sigdelset (&set, sig);
#else /* !HAVE_POSIX_SIGNALS */
# endif /* HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */
+#if defined (__EMX__)
+ signal (sig, SIG_ACK);
+#endif
+
+#if defined (HAVE_KILL)
kill (getpid (), sig);
+#else
+ raise (sig); /* assume we have raise */
+#endif
/* Let the signal that we just sent through. */
#if defined (HAVE_POSIX_SIGNALS)
# endif /* HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */
- (*rl_prep_term_function) (_rl_meta_flag);
- rl_set_signals ();
+ rl_reset_after_signal ();
}
+ RL_UNSETSTATE(RL_STATE_SIGHANDLER);
SIGHANDLER_RETURN;
}
#if defined (SIGWINCH)
static RETSIGTYPE
-rl_handle_sigwinch (sig)
+rl_sigwinch_handler (sig)
int sig;
{
SigHandler *oh;
disposition set by the calling application. We need this state
because we call the application's SIGWINCH handler after updating
our own idea of the screen size. */
- rl_set_sighandler (SIGWINCH, rl_handle_sigwinch, &dummy_winch);
+ rl_set_sighandler (SIGWINCH, rl_sigwinch_handler, &dummy_winch);
#endif
- if (readline_echoing_p)
- {
- _rl_get_screen_size (fileno (rl_instream), 1);
- _rl_redisplay_after_sigwinch ();
- }
+ RL_SETSTATE(RL_STATE_SIGHANDLER);
+ rl_resize_terminal ();
/* If another sigwinch handler has been installed, call it. */
oh = (SigHandler *)old_winch.sa_handler;
if (oh && oh != (SigHandler *)SIG_IGN && oh != (SigHandler *)SIG_DFL)
(*oh) (sig);
+ RL_UNSETSTATE(RL_STATE_SIGHANDLER);
SIGHANDLER_RETURN;
}
#endif /* SIGWINCH */
SigHandler *handler;
sighandler_cxt *ohandler;
{
+ sighandler_cxt old_handler;
#if defined (HAVE_POSIX_SIGNALS)
struct sigaction act;
act.sa_handler = handler;
+# if defined (SIGWINCH)
+ act.sa_flags = (sig == SIGWINCH) ? SA_RESTART : 0;
+# else
act.sa_flags = 0;
+# endif /* SIGWINCH */
sigemptyset (&act.sa_mask);
sigemptyset (&ohandler->sa_mask);
- sigaction (sig, &act, ohandler);
+ sigaction (sig, &act, &old_handler);
#else
- ohandler->sa_handler = (SigHandler *)signal (sig, handler);
+ old_handler.sa_handler = (SigHandler *)signal (sig, handler);
#endif /* !HAVE_POSIX_SIGNALS */
+
+ /* XXX -- assume we have memcpy */
+ /* If rl_set_signals is called twice in a row, don't set the old handler to
+ rl_signal_handler, because that would cause infinite recursion. */
+ if (handler != rl_signal_handler || old_handler.sa_handler != rl_signal_handler)
+ memcpy (ohandler, &old_handler, sizeof (sighandler_cxt));
+
return (ohandler->sa_handler);
}
+static void
+rl_maybe_set_sighandler (sig, handler, ohandler)
+ int sig;
+ SigHandler *handler;
+ sighandler_cxt *ohandler;
+{
+ sighandler_cxt dummy;
+ SigHandler *oh;
+
+ sigemptyset (&dummy.sa_mask);
+ oh = rl_set_sighandler (sig, handler, ohandler);
+ if (oh == (SigHandler *)SIG_IGN)
+ rl_sigaction (sig, ohandler, &dummy);
+}
+
int
rl_set_signals ()
{
sighandler_cxt dummy;
SigHandler *oh;
+#if defined (HAVE_POSIX_SIGNALS)
+ static int sigmask_set = 0;
+ static sigset_t bset, oset;
+#endif
#if defined (HAVE_POSIX_SIGNALS)
- sigemptyset (&dummy.sa_mask);
+ if (rl_catch_signals && sigmask_set == 0)
+ {
+ sigemptyset (&bset);
+
+ sigaddset (&bset, SIGINT);
+ sigaddset (&bset, SIGTERM);
+#if defined (SIGQUIT)
+ sigaddset (&bset, SIGQUIT);
+#endif
+#if defined (SIGALRM)
+ sigaddset (&bset, SIGALRM);
#endif
+#if defined (SIGTSTP)
+ sigaddset (&bset, SIGTSTP);
+#endif
+#if defined (SIGTTIN)
+ sigaddset (&bset, SIGTTIN);
+#endif
+#if defined (SIGTTOU)
+ sigaddset (&bset, SIGTTOU);
+#endif
+ sigmask_set = 1;
+ }
+#endif /* HAVE_POSIX_SIGNALS */
- oh = rl_set_sighandler (SIGINT, rl_signal_handler, &old_int);
- if (oh == (SigHandler *)SIG_IGN)
- rl_sigaction (SIGINT, &old_int, &dummy);
+ if (rl_catch_signals && signals_set_flag == 0)
+ {
+#if defined (HAVE_POSIX_SIGNALS)
+ sigemptyset (&oset);
+ sigprocmask (SIG_BLOCK, &bset, &oset);
+#endif
- oh = rl_set_sighandler (SIGALRM, rl_signal_handler, &old_alrm);
- if (oh == (SigHandler *)SIG_IGN)
- rl_sigaction (SIGALRM, &old_alrm, &dummy);
+ rl_maybe_set_sighandler (SIGINT, rl_signal_handler, &old_int);
+ rl_maybe_set_sighandler (SIGTERM, rl_signal_handler, &old_term);
+#if defined (SIGQUIT)
+ rl_maybe_set_sighandler (SIGQUIT, rl_signal_handler, &old_quit);
+#endif
+
+#if defined (SIGALRM)
+ oh = rl_set_sighandler (SIGALRM, rl_signal_handler, &old_alrm);
+ if (oh == (SigHandler *)SIG_IGN)
+ rl_sigaction (SIGALRM, &old_alrm, &dummy);
#if defined (HAVE_POSIX_SIGNALS) && defined (SA_RESTART)
- /* If the application using readline has already installed a signal
- handler with SA_RESTART, SIGALRM will cause reads to be restarted
- automatically, so readline should just get out of the way. Since
- we tested for SIG_IGN above, we can just test for SIG_DFL here. */
- if (oh != (SigHandler *)SIG_DFL && (old_alrm.sa_flags & SA_RESTART))
- rl_sigaction (SIGALRM, &old_alrm, &dummy);
+ /* If the application using readline has already installed a signal
+ handler with SA_RESTART, SIGALRM will cause reads to be restarted
+ automatically, so readline should just get out of the way. Since
+ we tested for SIG_IGN above, we can just test for SIG_DFL here. */
+ if (oh != (SigHandler *)SIG_DFL && (old_alrm.sa_flags & SA_RESTART))
+ rl_sigaction (SIGALRM, &old_alrm, &dummy);
#endif /* HAVE_POSIX_SIGNALS */
-
-#if defined (HANDLE_JOB_SIGNALS)
+#endif /* SIGALRM */
#if defined (SIGTSTP)
- oh = rl_set_sighandler (SIGTSTP, rl_signal_handler, &old_tstp);
- if (oh == (SigHandler *)SIG_IGN)
- rl_sigaction (SIGTSTP, &old_tstp, &dummy);
-#else
- oh = (SigHandler *)NULL;
+ rl_maybe_set_sighandler (SIGTSTP, rl_signal_handler, &old_tstp);
#endif /* SIGTSTP */
#if defined (SIGTTOU)
- rl_set_sighandler (SIGTTOU, rl_signal_handler, &old_ttou);
- rl_set_sighandler (SIGTTIN, rl_signal_handler, &old_ttin);
-
- if (oh == (SigHandler *)SIG_IGN)
- {
- rl_set_sighandler (SIGTTOU, SIG_IGN, &dummy);
- rl_set_sighandler (SIGTTIN, SIG_IGN, &dummy);
- }
+ rl_maybe_set_sighandler (SIGTTOU, rl_signal_handler, &old_ttou);
#endif /* SIGTTOU */
-#endif /* HANDLE_JOB_SIGNALS */
+#if defined (SIGTTIN)
+ rl_maybe_set_sighandler (SIGTTIN, rl_signal_handler, &old_ttin);
+#endif /* SIGTTIN */
+
+ signals_set_flag = 1;
-#if defined (HANDLE_SIGTERM)
- /* Handle SIGTERM if we're not being compiled as part of bash. */
- rl_set_sighandler (SIGTERM, rl_signal_handler, &old_term);
-#endif /* HANDLE_SIGTERM */
+#if defined (HAVE_POSIX_SIGNALS)
+ sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
+#endif
+ }
#if defined (SIGWINCH)
- rl_set_sighandler (SIGWINCH, rl_handle_sigwinch, &old_winch);
+ if (rl_catch_sigwinch && sigwinch_set_flag == 0)
+ {
+ rl_maybe_set_sighandler (SIGWINCH, rl_sigwinch_handler, &old_winch);
+ sigwinch_set_flag = 1;
+ }
#endif /* SIGWINCH */
return 0;
{
sighandler_cxt dummy;
-#if defined (HAVE_POSIX_SIGNALS)
- sigemptyset (&dummy.sa_mask);
-#endif
-
- rl_sigaction (SIGINT, &old_int, &dummy);
- rl_sigaction (SIGALRM, &old_alrm, &dummy);
+ if (rl_catch_signals && signals_set_flag == 1)
+ {
+ sigemptyset (&dummy.sa_mask);
-#if defined (HANDLE_JOB_SIGNALS)
+ rl_sigaction (SIGINT, &old_int, &dummy);
+ rl_sigaction (SIGTERM, &old_term, &dummy);
+#if defined (SIGQUIT)
+ rl_sigaction (SIGQUIT, &old_quit, &dummy);
+#endif
+#if defined (SIGALRM)
+ rl_sigaction (SIGALRM, &old_alrm, &dummy);
+#endif
#if defined (SIGTSTP)
- rl_sigaction (SIGTSTP, &old_tstp, &dummy);
-#endif
+ rl_sigaction (SIGTSTP, &old_tstp, &dummy);
+#endif /* SIGTSTP */
#if defined (SIGTTOU)
- rl_sigaction (SIGTTOU, &old_ttou, &dummy);
- rl_sigaction (SIGTTIN, &old_ttin, &dummy);
+ rl_sigaction (SIGTTOU, &old_ttou, &dummy);
#endif /* SIGTTOU */
-#endif /* HANDLE_JOB_SIGNALS */
+#if defined (SIGTTIN)
+ rl_sigaction (SIGTTIN, &old_ttin, &dummy);
+#endif /* SIGTTIN */
-#if defined (HANDLE_SIGTERM)
- rl_sigaction (SIGTERM, &old_term, &dummy);
-#endif /* HANDLE_SIGTERM */
+ signals_set_flag = 0;
+ }
#if defined (SIGWINCH)
- sigemptyset (&dummy.sa_mask);
- rl_sigaction (SIGWINCH, &old_winch, &dummy);
+ if (rl_catch_sigwinch && sigwinch_set_flag == 1)
+ {
+ sigemptyset (&dummy.sa_mask);
+ rl_sigaction (SIGWINCH, &old_winch, &dummy);
+ sigwinch_set_flag = 0;
+ }
#endif
return 0;
}
+
+/* Clean up the terminal and readline state after catching a signal, before
+ resending it to the calling application. */
+void
+rl_cleanup_after_signal ()
+{
+ _rl_clean_up_for_exit ();
+ if (rl_deprep_term_function)
+ (*rl_deprep_term_function) ();
+ rl_clear_pending_input ();
+ rl_clear_signals ();
+}
+
+/* Reset the terminal and readline state after a signal handler returns. */
+void
+rl_reset_after_signal ()
+{
+ if (rl_prep_term_function)
+ (*rl_prep_term_function) (_rl_meta_flag);
+ rl_set_signals ();
+}
+
+/* Free up the readline variable line state for the current line (undo list,
+ any partial history entry, any keyboard macros in progress, and any
+ numeric arguments in process) after catching a signal, before calling
+ rl_cleanup_after_signal(). */
+void
+rl_free_line_state ()
+{
+ register HIST_ENTRY *entry;
+
+ rl_free_undo_list ();
+
+ entry = current_history ();
+ if (entry)
+ entry->data = (char *)NULL;
+
+ _rl_kill_kbd_macro ();
+ rl_clear_message ();
+ _rl_reset_argument ();
+}
+
#endif /* HANDLE_SIGNALS */
+
+/* **************************************************************** */
+/* */
+/* SIGINT Management */
+/* */
+/* **************************************************************** */
+
+#if defined (HAVE_POSIX_SIGNALS)
+static sigset_t sigint_set, sigint_oset;
+#else /* !HAVE_POSIX_SIGNALS */
+# if defined (HAVE_BSD_SIGNALS)
+static int sigint_oldmask;
+# endif /* HAVE_BSD_SIGNALS */
+#endif /* !HAVE_POSIX_SIGNALS */
+
+static int sigint_blocked;
+
+/* Cause SIGINT to not be delivered until the corresponding call to
+ release_sigint(). */
+void
+_rl_block_sigint ()
+{
+ if (sigint_blocked)
+ return;
+
+#if defined (HAVE_POSIX_SIGNALS)
+ sigemptyset (&sigint_set);
+ sigemptyset (&sigint_oset);
+ sigaddset (&sigint_set, SIGINT);
+ sigprocmask (SIG_BLOCK, &sigint_set, &sigint_oset);
+#else /* !HAVE_POSIX_SIGNALS */
+# if defined (HAVE_BSD_SIGNALS)
+ sigint_oldmask = sigblock (sigmask (SIGINT));
+# else /* !HAVE_BSD_SIGNALS */
+# if defined (HAVE_USG_SIGHOLD)
+ sighold (SIGINT);
+# endif /* HAVE_USG_SIGHOLD */
+# endif /* !HAVE_BSD_SIGNALS */
+#endif /* !HAVE_POSIX_SIGNALS */
+
+ sigint_blocked = 1;
+}
+
+/* Allow SIGINT to be delivered. */
+void
+_rl_release_sigint ()
+{
+ if (sigint_blocked == 0)
+ return;
+
+#if defined (HAVE_POSIX_SIGNALS)
+ sigprocmask (SIG_SETMASK, &sigint_oset, (sigset_t *)NULL);
+#else
+# if defined (HAVE_BSD_SIGNALS)
+ sigsetmask (sigint_oldmask);
+# else /* !HAVE_BSD_SIGNALS */
+# if defined (HAVE_USG_SIGHOLD)
+ sigrelse (SIGINT);
+# endif /* HAVE_USG_SIGHOLD */
+# endif /* !HAVE_BSD_SIGNALS */
+#endif /* !HAVE_POSIX_SIGNALS */
+
+ sigint_blocked = 0;
+}
+
+/* **************************************************************** */
+/* */
+/* Echoing special control characters */
+/* */
+/* **************************************************************** */
+void
+rl_echo_signal_char (sig)
+ int sig;
+{
+ char cstr[3];
+ int cslen, c;
+
+ if (_rl_echoctl == 0)
+ return;
+
+ switch (sig)
+ {
+ case SIGINT: c = _rl_intr_char; break;
+ case SIGQUIT: c = _rl_quit_char; break;
+ case SIGTSTP: c = _rl_susp_char; break;
+ default: return;
+ }
+
+ if (CTRL_CHAR (c) || c == RUBOUT)
+ {
+ cstr[0] = '^';
+ cstr[1] = CTRL_CHAR (c) ? UNCTRL (c) : '?';
+ cstr[cslen = 2] = '\0';
+ }
+ else
+ {
+ cstr[0] = c;
+ cstr[cslen = 1] = '\0';
+ }
+
+ _rl_output_some_chars (cstr, cslen);
+}
projects / platform / upstream / bash.git / blobdiff